#include <stdio.h>
int main()
{
	int n,i,j;
	scanf_s("%d", &n);
	int arr[10][10];
	for (i = 0; i < n; i++)
	{
		for (j = 0; j < n; j++)
		{
			if (i == 0 || i == n - 1 || j == 0 || j == n - 1)
			{
				printf("* ");
			}
			else
			{
				printf("  ");
			}
		}
		printf("\n");
	}
	return 0;
}